Over-pressure valve for ventilation

Details Over-pressure valve for ventilation Over-pressure valve for ventilation

1979-09-21

1981-11-17

Largen, James R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D2304

Patent

active

D02619253

REFERENCES:
patent: D206466 (1966-12-01), Hull
patent: D231099 (1974-04-01), Purhonen
patent: D231100 (1974-04-01), Purhonen
patent: D252640 (1979-08-01), Nederman
patent: 3140648 (1964-07-01), Bergman et al.
patent: 3232208 (1966-02-01), Maassen
patent: 3369476 (1968-02-01), Seiz et al.
patent: 3459114 (1969-08-01), Baelini
patent: 3489073 (1970-01-01), Sauter et al.
patent: 3516348 (1970-06-01), Laakkonen et al.

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